6. 2005 Semifinals: Marat Safin Def. Roger Federer

In what has become known as one of the classic matches in Australian Open history, Marat Safin defeated Roger Federer in an epic five set battle 5-7, 6-4, 5-7, 7-6 (6), 9-7.

At that time, Federer was by far in a class of his own, and yet Safin found a way to not only go toe to toe with the world No. 1, but wear him down.

In the nearly 4 1/2 hour match that took place on Safin's 25th birthday, the Russian played his absolute best and for once in his life, he was composed en route to the major upset.

In fact, it was Federer who was tossing rackets and cursing in disgust.

Safin's huge serve and powerful groundstrokes were too much, not only humbled Federer, who had not dropped a set in the tournament prior to that match, but it garnered him a standing ovation from the crowd.

5. 2008 Semifinal: Jo-Wilfried Tsonga Def. Rafael Nadal

Rafael Nadal is touted as one of, if not the, fittest player on tour, and yet the unseeded Jo-Wilfried Tsonga wore him out in his straight sets demolition of the second seeded Nadal.

Nadal threw the kitchen sink at Tsonga, but it was a case of "anything you can do, I can do better" for the Frenchman who outmaneuvered the Spaniard, whilst hitting winners from both the baseline and at net.

After being steamrolled 6-2, 6-3, 6-2, even Nadal said there was nothing that he would have been able to do to stop Tsonga that night.

4. 2009 Final: Rafael Nadal Def. Roger Federer

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Roger Federer and Rafael Nadal have had many epic battles over the years, but this one left Federer in tears.

Nadal, who had played over five hours in a scintillating semifinal match against his countryman Fernando Verdasco in the semifinals, wasn't expected to put up much of a fight against the well-rested Federer on the hardcourts of Australia.

The Spaniard, however, showed what he was really made of when he battled in a four hour and 22 minute match against Federer to win the match 7-5, 3-6, 7-6(3), 3-6, 6-2.

This match was a roller-coaster from the beginning and at times, it looked as if either man could come out on top.

It was Nadal's first major final on a hard court, whereas Federer had been in eight hard court major tournament finals, all of which he had won.

And yet, it was Nadal who would come out on top to win his first major title on a hard court and become the first Spaniard to win the Australian Open.

Federer, on the other hand, was left to wait for another crack at tying Sampras' all-time major title record.

3. 2002 First Round: Alberto Martin Def. Lleyton Hewitt

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Aussie-native Lleyton Hewitt came into the 2002 Australian Open as the top seed in the tournament.

But, in his first tournament while ranked number one in the world, Hewitt crumbled after winning the first set to lose to the 39th-ranked Alberto Martin the first round 1-6, 6-1, 6-4, 7-6(4) in three and a half hours.

Hewitt won the first set with ease, but his game slowly fell apart after that.

There was even a bit of drama when Martin called the trainer because of cramps when he led 5-4 in the tiebreak, only two points from victory. Hewitt would go on to make two unforced errors and hand Martin the match, before suggesting that Martin's medical timeout was unfair.

Hewitt's loss marked the first time that a top seed had lost in the first round of a major tournament since 1990 and it was the first major where the top four seeds lost in the first two rounds.

2. 2006 R16: Marcos Baghdatis Def. Andy Roddick

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Is there anyone that doesn't love Marcos Baghdatis?

It was the match of his life and the biggest win of his career to date when the Cypriot defeated the second-seeded Andy Roddick in the fourth round 6-4, 1-6, 6-3, 6-4 and it made the world fall in love.

The fun-loving, 20-year-old Baghdatis charmed the crowd with both his personality and superb play en route to victory.

The best thing about Baghdatis? He played his best on the big points.

When serving for the match, he didn't just win the game—he won it at love.